Tie a big black shark fin on the roof
and cutouts of a few innocent potential victims on the hood
All that cardboard & duct tape you've been saving will be good for that.
On the stereo play Jaws music ghetto-boom-box-loud enough to rattle spectators' bones.
da da da da da
Punctuate the music with occasional blood curdling loud screams . . .
. . .sharks have to eat too
toss candy out the windows to the hopeful little kids all having to pee so bad but sitting there